Question : The SI unit of power of the lens is ________.
Option 1: candela
Option 2: mole
Option 3: watt
Option 4: dioptre
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Correct Answer: dioptre
Solution : The correct option is dioptre.
The SI unit of power of a lens is the dioptre (D). It quantifies the ability of a lens to converge or diverge light. Positive dioptre values indicate converging lenses, while negative values denote diverging lenses. One dioptre equals one focal length metre; higher values indicate a stronger prescription.
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